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Reg. 164
MANHOLES, MUDHOLES, ETC.

 

Access

a) Sufficient sight and cleaning holes shall be provided to permit of efficient inspecting and cleaning. Such holes shall normally be elliptical in form and not less than 3½ inches x 2½ inches*.

 

* Note – Standard sizes of mudholes and sightholes are 7”x5”; 5”x3½”; 3½”x2½”.

 

b) At least one manhole or sight hole shall be provided in the upper part of the cylindrical shell or in the shell crown, or end plate and this shall not be less than:-
 
  Inches
Boilers not exceeding 2 ft. 6 inches 9 x 7
Boilers over 2 ft. 6 inches diameter and not exceeding 3 ft. 12 x 9
Boilers over 3 ft. diameter and not exceeding 3 ft. 6 inches 14 x 10
Boilers over 3 ft. 6 inches diameter and not exceeding 4 ft. 15 x 11
Boilers over 4 ft. 16 x 12

c) Where the size or construction of the boiler does not permit of entry for cleaning and inspection sufficient cleaning holes shall be provided in the shell for these purposes.
d) Where cross tubes are fitted in Vertical boilers one cleaning hole shall be provided opposite at least one end of each tube. At the bottom of the narrow water spaces at least three cleaning holes shall be provided. The cleaning holes shall be so arranged that the circumferential distance between them does not exceed 3 ft. unless the foundation ring is sufficiently accessible to permit of cleaning and inspection from the inside of the boiler.
 
NOTE.- Wherever practicable the frames should be secured to the inside of the shells so that the shorter axis is parallel to the longitudinal centre line of the boiler.
   
e) Cleaning holes or mud holes in Loco Type boilers shall be provided at each bottom corner of the outer firebox casing, above the fire hole ring and on each side of saddle plate in line with bottom of barrel.
f) In the case of small boilers or where the foregoing provisions are impracticable the cleaning holes or mudholes shall be as nearly as possible in the corner of the outer firebox casing and the holes as large as circumstances permit.
 
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Message from Chairman of Central Boilers Board About Central Boiler Board History of Indian Boiler Regulations Foreword Contents Chapter Wise Contents Regulation Wise List of Amendments
Indian Boilers Act 1923 Ibr Forms Home Search Help Contact Us